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PubMed1975

[Some characteristics of fucidin biosynthesis].

Some features of fusidin biosynthesis by 2 strains of Fusidium coccineum were studied proceeding from the peculiar properties of the antibiotic molecule structure. It was found that an increase in the levels of the carbon sources in the medium stimulated the biosynthesis of fusidin, while excessive concentrations of nitrogen especially in its inorganic and amino acidpeptide forms stimulated the organism growth and lowered the antibiotic activity levels. The concentration of nitrogen in the medium is considered as one of the possible control mechanisms in the processes of the fungus growth and biosynthesis of fusidin.

Carbohydrate Metabolism↗
PubMed1979

Studies on termination of protein synthesis in wheat germ.

Oligophenylalanines are soluble in m-cresol, but oligophenylalanyl-tRNAs are not. This differential solubility can be used to assay oligophenylalanines released from tRNA during their synthesis by wheat germ extracts. When poly U is the message, virtually no free product appears. When poly A U (A < U) is used, a considerable amount of oligophenylalanines are released. The fraction of product released is approximately constant with time, implying that a steady-state is not achieved between initiation and release. The dependence of release on various reaction variables and the effects of several inhibitors on release indicate that the reaction is probably catalyzed by peptidyl transferase, in accord with the mechanisms described for mammals and prokaryotes.

Cell-Free System↗
PubMed1975

The choice of antibiotic for treating infective endocarditis.

The bacteriological spectrum of infective endocarditis is very different when the disease occurs spontaneously from when it follows shortly after cardiac surgery or is associated with narcotic abuse or haemodialysis. It is therefore suggested that two categories of the illness, naturally occurring and extraneous, are recognized. The great majority of cases of naturally occurring infective endocarditis are caused by organisms highly sensitive to penicillin. Oral therapy is nearly always effective in such cases and amoxycillin given with probenecid is recommended as the regime of choice. Extraneous infective endocarditis is most often caused by staphylococci, with Gram-negative bacilli and fungi also quite frequent infecting agents. Intravenous and oral therapy with a variety of antibiotics is discussed in the management of this group.

Adolescent↗
PubMed2003

[The impact of antibiotic use on hospital-acquired pneumonia: data of etiology tests].

AIM OF THE STUDY: To investigate most common pathogens isolated from the hospital-acquired pneumonia patients bronchoalveolar lavage fluid in Kaunas University of Medicine Hospital according to the previous antibiotic use and to estimate pathogens antibacterial susceptibility. MATERIALS AND METHODS: Results of 87 hospital-acquired pneumonia patients bronchoalveolar lavage fluid quantitative cultures were analyzed. Microorganisms isolated in clinically significant amount were considered as the etiological agents and included into analysis. Susceptibility was tested using the standard methods. Previously untreated patients were considered if the antibacterials were not administered at all or were used less than for 24 hours. RESULTS: H. influenzae isolation in significant amount rates were higher in previously untreated patients group comparing to previously treated (29.2%. (n=14) and 5.1% (n=2), respectively, p<0.05). Non-fermenters (P. aeruginosa and Acinetobacter spp.) isolation rates were higher in those previously treated comparing to untreated patients - (31.0% (n=13) and 4.2% (n=2), respectively, p<0.05). All H. influenzae strains were susceptible to ampicillin and cefuroxime. 22.2-44.4% of P. aeruginosa strains were resistant to ceftazidime, amikacin and ciprofloxacin. Estimated Acinetobacter spp. resistance to ciprofloxacin and gentamycin was 83.3% and to ampicillin/sulbactam - 16.7%. All methicillin-susceptible S.aureus were also susceptible to gentamycin and fucidin and methicillin resistant to rifampicin and vancomycin. CONCLUSIONS: Previous antibiotic treatment has an impact on pneumonia etiology testing. H. influenzae strains are more common isolated hospital-acquired pneumonia etiologic agents in previously untreated patients. The low antibacterial resistance was found enabling the use of aminopenicillins for treatment if H. influenzae infection suggested. The use of antibacterials increases non-fermenters isolation rates and combined antipseudomonal treatment is reasonable in these patients.

Acinetobacter↗
PubMed1976

[Utilization of automatic systems for determining the biological activity of antibiotics by the agar diffusion method].

The Automatic Zone Analyzer AR-140 of Millipor intertech., inc. is an apparatus used for measurement of inhibition growth zones of test-microbes and estimation of antibiotic activity. The analyzer provides automatic registration of the data with high levels of accuracy and at least 99% reproducibility. The analyzer gives an effect in saving time as compared to the manual method by 5-7 times for the single-dose procedure and by 10-12 times for the three-dose procedure.

Agar↗
PubMed2003

[Impetigo bullosa].

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Anti-Bacterial Agents↗